Internal problem ID [12855]
Book: DIFFERENTIAL EQUATIONS by Paul Blanchard, Robert L. Devaney, Glen R. Hall. 4th
edition. Brooks/Cole. Boston, USA. 2012
Section: Chapter 4. Forcing and Resonance. Section 4.1 page 399
Problem number: 15.
ODE order: 2.
ODE degree: 1.
CAS Maple gives this as type [[_2nd_order, _with_linear_symmetries]]
\[ \boxed {y^{\prime \prime }+4 y^{\prime }+3 y={\mathrm e}^{-4 t}} \] With initial conditions \begin {align*} [y \left (0\right ) = 0, y^{\prime }\left (0\right ) = 0] \end {align*}
✓ Solution by Maple
Time used: 0.016 (sec). Leaf size: 23
dsolve([diff(y(t),t$2)+4*diff(y(t),t)+3*y(t)=exp(-4*t),y(0) = 0, D(y)(0) = 0],y(t), singsol=all)
\[ y \left (t \right ) = -\frac {{\mathrm e}^{-3 t}}{2}+\frac {{\mathrm e}^{-t}}{6}+\frac {{\mathrm e}^{-4 t}}{3} \]
✓ Solution by Mathematica
Time used: 0.045 (sec). Leaf size: 26
DSolve[{y''[t]+4*y'[t]+3*y[t]==Exp[-4*t],{y[0]==0,y'[0]==0}},y[t],t,IncludeSingularSolutions -> True]
\[ y(t)\to \frac {1}{6} e^{-4 t} \left (e^t-1\right )^2 \left (e^t+2\right ) \]